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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6109f9834af37132ba8fec3df0b3f26ec8ae3016c2fb7aa14ede6136b5f17e' 
  AND token = '4Ieqw4kAwP2kZFWy1UIvBqjI8+mpkQ2X9pOQlb5sf8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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