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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d94525a5e15a1fe2876dc8263ec1004282cb800addc8a74e3d1ef3c185b13fa' 
  AND token = 'exfe7yfKTXcZfrUQNTQDPS2LdHPGJPWDSpF4rKE/VyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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