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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79161ee4e947818567c79f0f97061a6b179bdd20f707d60c6fedf7ab58b1823b' 
  AND token = 'VQWAnwLdpdvZvMw9YOf7C9Gi+Z7AGyibnC31/spkX7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}