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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b53dcf43d3263c267f0e2a959c0737f02c55b77b637df24e9018fb9febd2c74' 
  AND token = 'ShrBeI+6cpriwNL8HL9O+yvBnZKLamo323vz0KKuz4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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