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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd2c058f2d0bd823834c03ee35134f25f304748c360651f4c99e95b3cc23388' 
  AND token = 'rxc+0GrSfammPVpj2XRTz+5NqF+oD+Nr3hyg51P+L/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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