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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8949dcade9488ec390702bb9facd6b80e71b22a627b3df2216a9a9628bfb6303' 
  AND token = 'FAs91v5qP2poE0dW1amP4QoVJ+SUJs/J/Vf+ovk6Bjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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