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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d0a56e2cddbc40c88307d6660b0c01229aae1f76ca439f220f902063fd02d6' 
  AND token = 'rEOvx0W5Y1G2N3aKUaOAN+VN1WqQ3GqZPcdRNHIkE9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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