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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d4e8ce9e076b3e8795fb3a63f57c34cc516e5a5e6b1565c337bf4dce89132c' 
  AND token = 'PuDIRYNq1GO8iQ9Z1aaRXWiec9NFm2oK2lMdezBgmxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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