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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18ef75bb4dcfd13190a07976377b09a59a526627c0f8940d697985158a7efa7' 
  AND token = 'dmX6vvm57EHrm6FfADnKt8S61qXDfW3PIk5GllyLFHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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