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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e3e38a3f967ce7b36da467e984bf79534415f68ac0b7a674a0dd41270ee030' 
  AND token = '7PTFS4pQBzxsjExmryBW82Tt1poHMWhOF+sUheOevcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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