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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b8c9e08e2f3916e74f01eb09738d1f370fee40dea852d837333bf7343fe866' 
  AND token = 'LxdH+pXcjuIvOKEV0jdNBV+6gXX0TEcLJbTungq7L8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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