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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c6a4f5c3145132b0b62cfabb99382ac0f417eb45f55a9071e56b5dba6c3278' 
  AND token = 'lhq1tR08B1ELhZvQ75w97lGVzcGbHHcWtkXLubuCwvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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