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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bd2deef79f66174134127c1941aab0f4454733398cbcb1010e24db4caf7da3' 
  AND token = 'b1uWPhRzbdm8lsruWFB9YL3I18Fq3OOVu9lxySoFu8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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