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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a05637f1cd171e61651d4287c010fa89eda2cd4028ccf3cd2b2eaaa15c7a5e8' 
  AND token = 'AlMlf/1mdmK38r2C83CWSom7WoIGaWi4YBsC+Tp2GbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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