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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fce20c8cedbdd38ec457384daefefb1a6ee65092fd69acd6d62fa59ef2061cb' 
  AND token = 'XXiC+3oF9smisj44+SINgOc0OwgudRGb23CFg9zunJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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