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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1730de4c3924e2bccc4dd9a12352f16547c5a0c772a6cd90aeca8625178ec5' 
  AND token = '1FjH1jgQAEMJfBId83amlpsBUiu95fbVZwgT2Lg4QA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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