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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94031a1e86df6e0ff6fa42a48855c66da52f5ac0d476cc3d6d5225e27ae87a53' 
  AND token = 'FpE3dsUCszacGtbO+DhEp/qeIFD0Y0gVjM0sTsPNVdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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