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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be823dd760ea1110e02c9d23feb6c3d59d04d33d449fb34800e617526af4453b' 
  AND token = 'RlAduBhROxHPhLHcsmagkIPVNDX5Nm7z7AAYNDIk+kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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