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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa118db6b7c1085354ab0d4a4e165b283c898506d827640bfb6ce0655c32aec' 
  AND token = 'EB1mtSUYBNmUjvdT/q40PmfNkyp3yGKhW+TPsPLbHJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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