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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c1664925757fbfc25c8a7067a6569109f71b7b151c77ee06e986653441b120' 
  AND token = 'frRtg0A16E15FvaAHWgFDeQWyLSNqD9KfqtHBzbuh5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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