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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18328933a1e6a1f2ebdf5b1db27143f5c798a49053190e595cd4f43b707cb7b3' 
  AND token = 'Bobm3J00i6Nd2+d7bo7GkYLZJaoTuDLkGngV7Akhyew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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