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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738cc64e57fe5cbc13da37e665ae5db9994aca5199a520418e14f4c46a2089a8' 
  AND token = 'uCZcjO8/1vlT8ud8LuEIZPS/i5z/+QDLLVqzvXs78Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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