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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12221cc5e52bfb4edef8ed5c6bbff3bec704ea86f2d155f1088f1cf57eb2dbff' 
  AND token = 'SN2Mp25vcxC2bKYmoajJDMgRvgneZ5smi18EsU1om6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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