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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cd15c6353618cc69e8bce334757010410a1db3d70892560670f56e9e7098e3' 
  AND token = 'w+rw4Cv+/DfdH3upVhJUgFvk09jwi0UItIXGV+6pW0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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