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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520e3a246aeafa57bda1150270772fd7b237db124e3db2171e49542a861f82d4' 
  AND token = 'fdnyJFRK7l2PHv2S5Je59vcOXgcE8tSAh+ZZtT87C2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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