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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc80bab8ebb0fff4c1ca4583759fadb5d753b13a90eb2bc93b4791bfe1f22b62' 
  AND token = 'bijGIRRRHsb+wIra+HXorIb/gGtOyzwb8wTDddadoXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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