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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eada9e46a7264182ca44e5b5299ced59e37249df1b546f5bd389cfb134192fff' 
  AND token = 'wCEv/jjv1ET23SsnFB2Fcse79+KJDyp27XmfHkZtLVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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