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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6a36adc0da73418f821df7748564aa0d6515ec5aa288c4bfff822d9cb7c606' 
  AND token = 'gYjL55fWxy1c8KuMj3mlAEjlU7ipNv7kMaAk6P2baSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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