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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c5ae6430aee9872e8333f6b70411d33431d8d2567682995d2a1d32bf43a924' 
  AND token = 'j1+qU5yLUktNy2Kxtf30h2o7QcKS/a2JhfVhExM4+2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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