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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72767782239278f323e882f80e62a96db29f3cbe891693b7d238f6743bd5c52e' 
  AND token = 'j7Y1Uwbt6G8Sr4bTaGAOJ/+qn2fnazMFt9f1qfndgC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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