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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12fb130949f51ecabe320c3e849914f5d2e317ce10accb8c511c9d931ab5a51' 
  AND token = 'VDKIK0asj25whyUfGrhfWhT4BzDS7MBVq3XW70d3cp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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