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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a6e522ab369c4ecccd6aba0b78dc305bf0fe11eb6660299af217e8d2ae33ed' 
  AND token = '8SsyvjPFkKhavm6KTzCA8r8xOJuY60L6kNMtaf5q6Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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