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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f002a6098deac958d05d230537c73ff66316563a1b80af249fb94cf6ebc6e2a9' 
  AND token = 'c7Lk+gT3iw/PTSp7zTj0tSax9neeLNV6aMeSmiI5uJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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