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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5aaee7c68a09030272aee3d45ab84ce7b981665fe3f43926d6126f5259998fb' 
  AND token = 'cI2/8imzvvFZMcpP5x1qaJ/MdSrxYNso98HS1sRx1og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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