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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d87a4152bf0e286bdc4e14b3d83081a33f862e504420f070d8fbbb9b0c8a2df' 
  AND token = 'XqphrGyvbPIKPTBzdKlfMCIxlOzMNflAq8PDJvSrxDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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