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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c164bbb3549bbd878868b10bbd11147fe98c45c47352331f08be628e89aeed5' 
  AND token = '68XabG5cuLYeHNe878Q34yqKBIrBPdxx8Y+uUhdP75c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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