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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1df14ef842a2608be23b1be0700df545e565103bceca9d0dd5d578121b880f6' 
  AND token = 'qBida/KS2OY/laXk1NEDm2EE4YWtdLor6oCbQ35MxRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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