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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f280f56df42d1900da00ee3caa99d5f68f0737ac3b401a94bd9b2c8a550e268' 
  AND token = 'cCq/gfV0MH/5G/cBHUbv6OX1/ncGi5ptMtLxcwzocWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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