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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305bb6b0ecb4d8d84c5ed6969049d7b5d7561aa9792df3ec4e2e80886c89f3b6' 
  AND token = 'mOWH+Vbo/Cb1DalDKdTUV16NQo+Sizz2DLOyVv8IaGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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