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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4518837bc2e1f3adbc440997843ef7b2871f925359e3eecebf0440cb9c028540' 
  AND token = 'ox292FV5bzVFNX4UHpc/ABQMW3EGFvJQoBxcuRdLzN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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