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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d679f483f400a9f2597c4bf57ce41456f9f55fe2e50a2dc1dcc8c86b1f4ce2e' 
  AND token = 'o0eRqBGMjVmAKFFEemS505dsYa2ctERKAATIiGx0xnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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