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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d085b1a5061ad20146a181d4bef68fb7ba6b0f6fd8a773635076def3db938e' 
  AND token = 'XTPTymJUo4f2ssJoJOY6ryiFDistNnv8Y65BY2eKK+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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