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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da16b39d1bf70a550f6b9be441b1a1307c674f5426ab35169f38b3e2b38cc004' 
  AND token = '675y4Ok5jrUPTAeJ4rI6OEaF4X7XCNEfZLmeH/89QHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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