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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f400c2a76bece8c434fc794e42b1c509901654158c03ff3bfbd7f28d065f4c7' 
  AND token = '5aiT4Jwy3vbT6sfLoCesl418Vy+hGEKuzIysmtdhmOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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