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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6629fe811084d907bf3dccf1c14a24f10129401333beae1d9fb5a4e24d4a0be8' 
  AND token = 'Bpbb9DwH03RfiM9K0Sunx0y+QlyJm2rFvEiFLKG5Sfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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