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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8558cd30f2a2bede985e8843efb51a01f5f37fa0e5ef336e85418d8708d3201f' 
  AND token = '+XI/8WcsC4LJfTrctSq9e3F1XlhR7EVvlGLUKeMhb/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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