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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98ca150171fdaaa56eed589786ec77e580327d48619e0842201da3a0195ecab' 
  AND token = 'DfxF0hL9f+X2Sk3NNlOhOqP1lxo+pfCvCtu8VN8UEjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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