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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b5b011b1c30ce730c8f25aad39161e2afb43bdf4e6b4be7a28c62def0616cf' 
  AND token = 'mXON7WrXOV+N2/Xn1abOS+tggoCvA6gdQsxQhcCRXlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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