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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07db3904eca5754efd759906d593062aed529426fcc0ac1561aa5ed85b8fbe7e' 
  AND token = 's6fHX7+kS9aaHkzIZnCSkKgvTHltL+sJlb2LSvKto50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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