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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26508f854a9903922118e8525dab6d8d01e050b866133cb2b28eb7483357b6eb' 
  AND token = 'qinUfG4CPbSIo+WjfJhllpNLHdll2Nz2aCSPNY2heSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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