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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9823162057222b51a591dfbf1031d6922fda033935f23c744dbf2a2f8d5014d0' 
  AND token = 'hFggkRH3fBOArph4ISln5g1LaPOQ51wyFayGzL9IVUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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