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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c831e5be99f2183e4a2c03397971dc3fb065cffb0e930a6566bd216b4d2af4d' 
  AND token = '1TO0DStsrmTdB3D12fDZI+kMRZM3G/Wki/7ZuBqJfyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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