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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ac4c7a376fd1d4dd3c96a09de1cd871cc485667158672c452a11c5f4fae75a' 
  AND token = 'BduVTO4phXqwR6eCKjIFYTOTIMF+iXYr5cwoEXwqLFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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